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defon
2 years ago
11

Four students wrote different analogies to describe an electron before the formation of an ionic bond . Student A: A tug of war

between two wrestlers each weighing 460 lbs Student B: A dog and his owner tugging at a frisbee Student A big greedy dog stealing away a bone from a smaller dog Student D: Children exchanging their orange and strawberry flavored popsicles Which student presented a correct analogy ?
Chemistry
1 answer:
Nutka1998 [239]2 years ago
3 0

The correct analogy is that of "A big greedy dog stealing away a bone from a smaller dog."

An ionic bond is a bond formed formed between a metallic atom and a non-metallic atom.

The metallic atom is electropositive while the non-metallic atom is electronegative. Therefore, the metallic atom donates or gives up its electrons to the non-metallic atom which accepts the electrons.

During the formation of chemical bonds, only valence or outermost shell electrons are involved.

Metallic atoms have few valence electrons (between 1 to 3 electrons) while non-metallic atoms have many valence electrons (between 5 to 7 electrons).

Therefore the analogy by the student of a big greedy dog stealing away a bone from a smaller dog is correct because the non-metallic atoms takes the few electrons of the metallic atom and add to the many electrons they already have during the formation of an ionic bond.

Learn more about an ionic bond at: brainly.com/question/1225796

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2 years ago
You decided to prepare a phosphate buffer from solid sodium dihydrogen phosphate (NaH2PO4) and disodium hydrogen phosphate (Na2H
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Answer:

For disodium hydrogen phosphate:

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For sodium dihydrogen phosphate:

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Explanation:

First, you have to put all the data from the problem that you going to use:

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What we need to find the pKa of the weak acid, in this case NaH2PO4, for that you need to find the Ka (acid constant) of NaH2PO4, and for this we use the pKa of the phosphoric acid as follow:

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So, for the preparation of buffer, you need to use the pKa that is near to the value of the pH that you want, so the choice will be:

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Now we going to use the Henderson Hasselbalch equation for the pH of a buffer solution:

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The solution of the problem is attached to this answer.

Download odt
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